The definition of air pollution is one that refers to the pollution of the air, regardless of whether it is indoor or outdoor. A physical, biological or chemical change to the air in the atmosphere can be termed as pollution. There are several main causes of air pollution such as fossil fuel burning, agricultural activities, emissions from factories and industries, mining activities and indoor air pollution. Air pollution is alarming, so governments around the world need to have appropriate policies on environmental protection, especially air quality to create a clean world for our generation future.

Like you know, our world becomes more polluted and air pollution is the worst of all. Firstly, air pollution come from smog from factories, it can affects human lungs and can cause symptoms such as shortness of breath, cough,... Secondly, air pollution is coming from smoke and dust from vehicles such as car, motorbikes, bus,... Finnaly, air pollution comes from the daily waste generated by people, and the worst is the smoke from cigarettes, it not only affects the smoker but also the person who inhales it. In conclusion, air pollution not only harm the human respiratory system but also breaks down the ozone layer that protects people from ultraviolet rays.